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Re:Arduino Yún – combining Arduino with Linux by krapht on Tuesday May 21, 2013 @04:36PM (#5746656)
X10 powered sockets are $20, and do exactly what you described, yet don't have wide adoption at all.
Re:Arduino Yún – combining Arduino with Linux by wiredfool on Tuesday May 21, 2013 @04:59PM (#5746788)
They've been around forever, and I dismissed them back in the internet dark ages because they only had crappy windows software and their obnoxious intrusive ads seemed to be all about "security" cameras pointing at scantily clad women.

/me realizes that I've just dated myself here.